MEXICAN AMPHIBIANS—TAYLOR AND SMITH 551 
There are, however, remarkable differences in the appearance of 
the tongue in various specimens. In one, at least, it fills the cavity 
of the mouth, while in others it appears to be reduced to an organ 
only a fourth or a fifth of the size of that mentioned. ‘This species 
has the tongue free anteriorly. 
Family PELOBATIDAE Lataste, 1879 
Genus SCAPHIOPUS Holbrook, 1836 
SCAPHIOPUS COUCHII Baird 
Scaphiopus couchi Batrp, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, 1854, p. 62 
(Rio Nazas, Coahuila, and Matamoros, Tamaulipas). 
Kighteen specimens are from the following localities: CHIHUAHUA: 
1 mile south of Ahumada, October 9, 19388 (U.S.N.M. No. 105176); 
Rio Santa Maria, near Progreso, October 12-14, 1938 (U.S.N.M. 
Nos. 105162-105175). Tamauvuipas: Hacienda La Clementina, 4 
miles west of Forl6n, November 22, 1938 (U.S.N.M. Nos. 105251- 
106253). 
SCAPHIOPUS MULTIPLICATUS Cope 
Scaphiopus multiplicatus Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 15, 1863, 
p. 52 (Valley of Mexico). 
Nine specimens were picked up as they hopped along the road at 
night during a shower, about 13 km. north of Venta del Carpio, 
México, May 1, 1939 (U.S.N.M. Nos. 114044-114052). These 
specimens may be regarded as topotypic, since the type locality is 
not specific, but includes the locality mentioned, which lies about 
30 km. north of México (City). 
Family BUFONIDAE Hogg, 1841 
Genus BUFO Laurenti, 1768 
BUFO HORRIBILIS Wiegmann 
Bufo horribilis W1EGMANN, Isis von Oken, vol. 26, pt. 7, 1833, pp. 654—655 (vicinity 
of Veracruz, México). 
Bufo marinus Krniioee, U. 8. Nat. Mus. Bull. 160, 1932, pp. 53-57, fig. 11. 
We are quite convinced that Bufo marinus Linnaeus, as generally 
accepted, comprises species or/and subspecies and is in fact of almost 
generic significance. However, certain difficulties are involved in 
properly delineating and naming these forms. In the first place the 
type localities of Bufo marinus and B. agua are unknown except that 
they are from the Western Hemisphere. Bufo maculwentris and B. 
lazarus of Spix are Brazilian, but lack exact localities; B. actericus 
Spix, however, is cited with Rio de Janeiro as type locality. B. humer- 
alis Daudin “existe dans diverses countrées meridional du nouveau 
continent.’? He mentions one in the Muséum d’Histoire Naturelle 
